Plaster board, and acoustic tiles above that then a green sawn single ring at ceiling height for lights.
Then acoustic tile the inside of door, rubber floor mats n get the drums, mixing desk, PA, amps etc back in.
Inside its 25Sqm, 4.5x5.5 mrters so plenty big enough.

From outside to inside 3 door air-lock

Exterior walls: 4x2 stud OSB sandwich

Cladding>house Wrap>OSB>Vapour shield>loft Insualtion> OSB ......With Metal Framed Door (1)


Then 50mm air gap to room within a room.

Inner room :4x2 stud OSB/Plasterboard Sandwich

OSB >Pondliner/ DMP>Sound insulation>Plasterboard inner. With framed doors (2+3) each side of inner sandwich.

Nealry used up all my scrap wood from the carport build as noggins, cripples and jacks etc.
Oh yea and have two large dutbins full of kindling!

Forgot to mention this was an old stable, the floor is like a mattress with tow fat peeps standing on and on one sitting on one end corner its crooked as fook.